TIDA-01555 Reference Design

Texas Instruments

Flexible Interface (PRU-ICSS) Reference Design for Simultaneous: Coherent DAQ Using Multiple ADCs

Description

This reference design showcases an interface implementation for connecting multiple high voltage bipolar input, 8-channel, mux-input SAR ADCs (6) with the Sitara Arm processors for expanding the number of input channels using Programmable Real-time Unit (PRU-ICSS). ADCs are configured for simultaneous sampling of the same channels across all ADCs. The design highlights the capability of PRU-ICSS to handle 1536ksps (each sample = 16 bits) data rate by sampling 640 samples per line cycle. For 50Hz cycle, this corresponds to 32ksps per channel across 6 ADCs simultaneously (640 samples/cycle*50Hz*6 ADCs*8 Ch = 1536ksps). Also, the second PRU is used to post process the data to achieve coherent sampling.

Features
  • Flexible interface using PRU-ICSS (Sitara Processor) for communicating with multiple SAR ADCs
  • AC voltage and current measurement accuracy: AC Voltage: <±0.2% for 2.5V to 120V; AC Current: <±0.2% for 2.5A to 70A; and Simultaneous sampling across six ADCs (16-bit, 500ksps/ADC)
  • PRU-ICSS Interface: Programmable real-time unitiIndustrial communication subsystem (PRU-ICSS) offers flexible data capture for channel expansion; Firmware-based approach allows for reuse across different Sitara processors; and Coherent sampling is achieved by computing line cycle in software and by adjusting CS signal
Applications
  • Data acquisition (DAQ)
  • Multifunction relay
  • Avionics remote data concentrator
  • AC analog input module
Product Categories
  • Data converters

Parts

Part Number Name Companion Part
ADS8688ATDBTR ADS8688ATDBTR Datasheet
AM3356BZCZA30 AM3356BZCZA30 Buy Datasheet
AM3357BZCZA60 AM3357BZCZA60 Buy Datasheet
AM3358BZCE60 AM3358BZCE60 Buy Datasheet
AM3359BZCZA80 AM3359BZCZA80 Buy Datasheet
CDCLVC1106PWR CDCLVC1106PWR Buy Datasheet
LP2992IM5X-5.0/NOPB LP2992IM5X-5.0/NOPB Buy Datasheet
OPA4197ID OPA4197ID Buy Datasheet
SN74LV1T04DCKRG4 SN74LV1T04DCKRG4 Buy Datasheet
SN74LVC1G17DCK3 SN74LVC1G17DCK3 Datasheet
TPS22914CYFPR TPS22914CYFPR Buy Datasheet
TPS65131RGET TPS65131RGET Buy Datasheet
TPS7A3901DSCR TPS7A3901DSCR Buy Datasheet
TPS7A6550QKVUQ1 TPS7A6550QKVUQ1

Bill Of Materials

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Schematic

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Test Data

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Other Documents

Title Updated Type Size (KB)
Flexible Interface (PRU-ICSS) Reference Design for Simultaneous, Coherent DAQ (Rev. A) 03 Jan 2019 PDF 1929
TIDA-01555 Gerber 20 Dec 2017 ZIP 7628
TIDA-01555 CAD Files 20 Dec 2017 ZIP 5446
TIDA-01555 Layer Plots 20 Dec 2017 ZIP 4674
TIDA-01555 Assembly Files 20 Dec 2017 ZIP 733
TIDA-01555 BOM Files 20 Dec 2017 ZIP 400
TIDA-01555 Schematic Files 20 Dec 2017 ZIP 1659